I go to three cons (Anime North, and a small anime con and a Ren-fest that are in my boyfriend's town so much cheaper to attend since we don't need a hotel), and usually I do something for Halloween and a cosplay meetup once a year that doesn't cost anything. ....so a grand total of five? Or three and two small events?
For the second part of your question, "too much" is highly dependent on the person. Some people have money and energy to go to something every month, some are good with one per season, some two a year, some just the one... I think if I added one more event in late summer/early fall, I'd be at my money/not fatigued by events and things to make limit on my end.

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Originally Posted by Moofingham

There is a vibe here that says "We're in this together! Through thick and thin fabric! Through cold water washes and burning hot irons! Though we might super glue ourselves to our projects, cut holes/gashes/oh-god-mom's-gonna-kill-me into the dining room table, we will stand strong together. Unless there is a 75% off sale at the Fabric store. Then you're on your own. And get the hell out of my way." <3